const app = () => {
    // 内容自定，不得低于5行代码。最终返回运行结果.
    var a = 0.01;
    var b = 1;
    var c = 0;
    while (a <= 30) {
        a *= 2;
        c += a
    }
    console.log(c);
    while (a <= b) {
        a *= 2;
        c++
    }
    console.log('对折了' + c + '次到1毫米');
}

export default app